package com.fancy.user.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configurers.AbstractHttpConfigurer;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.CorsConfigurationSource;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;

import java.util.Arrays;

/**
 * Spring Security配置类
 */
@Configuration
@EnableWebSecurity
public class SecurityConfig {

    /**
     * 密码编码器
     */
    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }

    /**
     * CORS配置
     */
    @Bean
    public CorsConfigurationSource corsConfigurationSource() {
        CorsConfiguration configuration = new CorsConfiguration();
        configuration.setAllowedOriginPatterns(Arrays.asList("*"));
        configuration.setAllowedMethods(Arrays.asList("GET", "POST", "PUT", "DELETE", "OPTIONS"));
        configuration.setAllowedHeaders(Arrays.asList("*"));
        configuration.setAllowCredentials(true);
        configuration.setExposedHeaders(Arrays.asList("Authorization", "X-User-Id", "X-Username"));

        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", configuration);
        return source;
    }

    /**
     * Security配置
     */
    @Bean
    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
        http
            // 禁用CSRF
            .csrf(AbstractHttpConfigurer::disable)
            // 启用CORS
            .cors(cors -> cors.configurationSource(corsConfigurationSource()))
            // 禁用Session
            .sessionManagement(session -> session.sessionCreationPolicy(SessionCreationPolicy.STATELESS))
            // 禁用frame options
            .headers(headers -> headers.frameOptions().disable())
            // 允许所有请求
            .authorizeHttpRequests(auth -> auth.anyRequest().permitAll());

        return http.build();
    }
}
